// This source file is part of the polarphp.org open source project
//
// Copyright (c) 2017 - 2019 polarphp software foundation
// Copyright (c) 2017 - 2019 zzu_softboy <zzu_softboy@163.com>
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://polarphp.org/LICENSE.txt for license information
// See https://polarphp.org/CONTRIBUTORS.txt for the list of polarphp project authors
//
// Created by polarboy on 2018/07/12.
//===- llvm/unittest/Support/DataExtractorTest.cpp - DataExtractor tests --===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include "polarphp/utils/DataExtractor.h"
#include "gtest/gtest.h"

using polar::basic::StringRef;
using polar::utils::DataExtractor;

namespace {

const char numberData[] = "\x80\x90\xFF\xFF\x80\x00\x00\x00";
const char stringData[] = "hellohello\0hello";
const char leb128data[] = "\xA6\x49";
const char bigleb128data[] = "\xAA\xA9\xFF\xAA\xFF\xAA\xFF\x4A";

TEST(DataExtractorTest, testOffsetOverflow) {
   DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
   EXPECT_FALSE(DE.isValidOffsetForDataOfSize(-2U, 5));
}

TEST(DataExtractorTest, testUnsignedNumbers)
{
   DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
   uint32_t offset = 0;

   EXPECT_EQ(0x80U, DE.getU8(&offset));
   EXPECT_EQ(1U, offset);
   offset = 0;
   EXPECT_EQ(0x8090U, DE.getU16(&offset));
   EXPECT_EQ(2U, offset);
   offset = 0;
   EXPECT_EQ(0x8090FFFFU, DE.getU32(&offset));
   EXPECT_EQ(4U, offset);
   offset = 0;
   EXPECT_EQ(0x8090FFFF80000000ULL, DE.getU64(&offset));
   EXPECT_EQ(8U, offset);
   offset = 0;
   EXPECT_EQ(0x8090FFFF80000000ULL, DE.getAddress(&offset));
   EXPECT_EQ(8U, offset);
   offset = 0;

   uint32_t data[2];
   EXPECT_EQ(data, DE.getU32(&offset, data, 2));
   EXPECT_EQ(0x8090FFFFU, data[0]);
   EXPECT_EQ(0x80000000U, data[1]);
   EXPECT_EQ(8U, offset);
   offset = 0;

   // Now for little endian.
   DE = DataExtractor(StringRef(numberData, sizeof(numberData)-1), true, 4);
   EXPECT_EQ(0x9080U, DE.getU16(&offset));
   EXPECT_EQ(2U, offset);
   offset = 0;
   EXPECT_EQ(0xFFFF9080U, DE.getU32(&offset));
   EXPECT_EQ(4U, offset);
   offset = 0;
   EXPECT_EQ(0x80FFFF9080ULL, DE.getU64(&offset));
   EXPECT_EQ(8U, offset);
   offset = 0;
   EXPECT_EQ(0xFFFF9080U, DE.getAddress(&offset));
   EXPECT_EQ(4U, offset);
   offset = 0;

   EXPECT_EQ(data, DE.getU32(&offset, data, 2));
   EXPECT_EQ(0xFFFF9080U, data[0]);
   EXPECT_EQ(0x80U, data[1]);
   EXPECT_EQ(8U, offset);
}

TEST(DataExtractorTest, testSignedNumbers) {
   DataExtractor DE(StringRef(numberData, sizeof(numberData)-1), false, 8);
   uint32_t offset = 0;

   EXPECT_EQ(-128, DE.getSigned(&offset, 1));
   EXPECT_EQ(1U, offset);
   offset = 0;
   EXPECT_EQ(-32624, DE.getSigned(&offset, 2));
   EXPECT_EQ(2U, offset);
   offset = 0;
   EXPECT_EQ(-2137980929, DE.getSigned(&offset, 4));
   EXPECT_EQ(4U, offset);
   offset = 0;
   EXPECT_EQ(-9182558167379214336LL, DE.getSigned(&offset, 8));
   EXPECT_EQ(8U, offset);
}

TEST(DataExtractorTest, testStrings)
{
   DataExtractor DE(StringRef(stringData, sizeof(stringData)-1), false, 8);
   uint32_t offset = 0;

   EXPECT_EQ(stringData, DE.getCStr(&offset));
   EXPECT_EQ(11U, offset);
   EXPECT_EQ(nullptr, DE.getCStr(&offset));
   EXPECT_EQ(11U, offset);
}

TEST(DataExtractorTest, testLEB128)
{
   DataExtractor DE(StringRef(leb128data, sizeof(leb128data)-1), false, 8);
   uint32_t offset = 0;

   EXPECT_EQ(9382ULL, DE.getULEB128(&offset));
   EXPECT_EQ(2U, offset);
   offset = 0;
   EXPECT_EQ(-7002LL, DE.getSLEB128(&offset));
   EXPECT_EQ(2U, offset);

   DataExtractor BDE(StringRef(bigleb128data, sizeof(bigleb128data)-1), false,8);
   offset = 0;
   EXPECT_EQ(42218325750568106ULL, BDE.getULEB128(&offset));
   EXPECT_EQ(8U, offset);
   offset = 0;
   EXPECT_EQ(-29839268287359830LL, BDE.getSLEB128(&offset));
   EXPECT_EQ(8U, offset);
}

}
